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boolean issues
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boolean issues // Archive: Tech Forum
Post by rjeff // Sep 30, 2007, 2:37pm
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rjeff
Total Posts: 1260
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Ok what would cause this. I am trying to cust a cylinder out of a object. Inseated of cutting it out properly it attaches it self to it. So then I have the orignial object with the drill attached. It is like it has did a union instead of substraction. And no I don't have union selected it is subtract |
Post by rjeff // Sep 30, 2007, 3:33pm
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rjeff
Total Posts: 1260
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add one more issue to this post. For some reason now when I create a cylinder it makes a cone? What is up. |
Post by spacekdet // Sep 30, 2007, 3:34pm
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spacekdet
Total Posts: 1360
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Right Click on the cone primitive icon and adjust the settings there. |
Post by Tiles // Sep 30, 2007, 9:22pm
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Tiles
Total Posts: 1037
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Boolean is very tricky sometimes. Under some circumstances it cannot bool, and creates wrong geometry instead. What can cause this is to have a face of the bool object and the drill object aligned for example. And i think that is what happened to you. Boolean failed, and it melted the stuff together instead of booling it.
My advice would be to divide your drill and have a look if it still happens. If so, try to change the position or the size of your drill. Next try to change the boolean identity down to 1. When it still fails, well, you can always model your mesh instead bool it :D |
Post by dave_k // Oct 1, 2007, 2:43am
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dave_k
Total Posts: 81
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You also have a better chance of success if the two objects to be booleaned have roughly the same number of polys. |
Post by Chester Desmond // Oct 1, 2007, 4:06am
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Chester Desmond
Total Posts: 323
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For the first issue, make sure you have "keep drill" unchecked. |
Post by rjeff // Oct 1, 2007, 2:27pm
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rjeff
Total Posts: 1260
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ok I have reset the cpu and still when I select the cylinder it puts a cone there. This makes no sense. |
Post by jamesmc // Oct 1, 2007, 3:00pm
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jamesmc
Total Posts: 2566
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Shows the dialog box for the object subtraction (boolean)
One that does keep the drill (the objected subtracted)
and
The other that keeps the drill (the object subtracted, but object is saved for re-use) |
Post by Tiles // Oct 1, 2007, 8:42pm
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Tiles
Total Posts: 1037
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You also have a better chance of success if the two objects to be booleaned have roughly the same number of polys.
I never heard about that. And i never made such an experience :) |
Post by Nez // Oct 1, 2007, 10:34pm
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Nez
Total Posts: 1102
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Not sure which version you are using, but presume the settings are similar for newer versions (this is screen cap from TS5):
For the cylinder/cone issue, check the following is set properly - when you left click on the cylinder primitive, and then right click on it before placing a cylinder, a settings panel similar to that shown below should appear; check the three numbers ringed, whcih adjust the top and bottom radii of the cylinder.
For a while, my truespace setup defaulted to producing cylinders with different top and bottom radii, producing truncated cones. I don't remember fixing it specifically, but you can adjust the settings here to gurantee a proper cylinder is produced.
NB - this is a different panel than the one you get right-clicking the cylinder primitive before left clicking it - that one is more basic. The advanced one allows you to make those adjustments too but adds a number of extras, such as the radii controls.
If this doesn't do it, then I'm not sure where the problem is...
And yes, booleans can be a pain - save before you do any boolean, and preferable make/keep copies of the drill and base object in case it doesn't work quite as planned.... |
Post by TomG // Oct 2, 2007, 6:14am
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TomG
Total Posts: 3397
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As Nez says , for the cylnder one face has been set really small so it looks like a cone. Restarting the computer won't clear this, tS will still remember the settings, so your cylinder will still look like a cone. Nez's diagram shows how to fix :)
For the boolean, booleans are very complex and often go wrong (in all 3D packages). Many folks recommend not using booleans for this reason as they can give unpleasant results.
Solutions are try moving the objects a little bit, depending on how the edge of one object touches the edge of another that can adjust the result. You can try adjusting the various parameters for the boolean (right click on the boolean tool to open them). Mostly moving the objects is the best answer though. Tiles covered it all in the earlier reply.
HTH!
Tom |
Post by rjeff // Oct 2, 2007, 3:14pm
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rjeff
Total Posts: 1260
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ok here is a screen print of what happens when I click on cylinder and what you see on the screen. I also have expanded what my cylinder settings look like. Any suggestions. |
Post by trueBlue // Oct 2, 2007, 3:24pm
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trueBlue
Total Posts: 1761
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Try these settings: |
Post by rjeff // Oct 2, 2007, 4:00pm
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rjeff
Total Posts: 1260
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yeah I figured out what I need to insert in there to make it work, my question is why on earth it changed to the cone setting. |
Post by jamesmc // Oct 2, 2007, 6:32pm
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jamesmc
Total Posts: 2566
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They change because somehow the settings got changed in those values.
If you hover your mouse over each of the black double headed arrows, you can find out what they do.
For instance, two of these objects started out as the cube on the right. I applied changes to them by right clicking on the add primitive and then changing the values.
You can make a new scene and everything should go back to default. |
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